blocks|key|667903|text|我在两种情况下遇到了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|667904|首先，当我尝试使用msbuild.exe从命令行构建我的解决方案时。其次，当我尝试使用TFS和CI在构建服务器上构建sln和包含项目时。|667905|我收到错误，声称缺少引用。在检查我的本地build目录和TFS服务器时，我看到没有创建/packages文件夹，也没有复制nuget包。按照亚历山大答案中列出的说明，http://nuget.codeplex.com/workitem/1879对我也不起作用。|offset|length|667906|我已经通过VS2010启用了恢复包，并且我看到构建只能在VS2010中工作。同样，使用msbuild的变通方法可能是完全无效的，但对于我的环境来说，这使所有工作都从本地命令行构建开始，也从fails.My中的CI构建开始。|667907|我进入.\nuget并在.nuget\NuGet.targets文件中更改了这一行：|667908|发自：|667909|<RestoreCommand>$(NuGetCommand)+install+"$(PackagesConfig)"+-source+"$(PackageSources)"+-o+"$(PackagesDir)"</RestoreCommand>|code-block|syntax|javascript|667910|to：(注意，变量两边没有引号)|667911|<RestoreCommand>$(NuGetCommand)+install+$(PackagesConfig)+-source+$(PackageSources)+-o+$(PackagesDir)</RestoreCommand>|667912|我知道如果我的目录中有空格，这将失败，但是我的目录中没有空格，所以这个变通方法让我的构建暂时完成了successfully...for。|667913|我要说的是，在构建中打开诊断级别日志记录将有助于显示msbuild正在执行的命令。这就是导致我暂时破解目标文件的原因。|667914|entityMap|0|LINK|mutability|MUTABLE|url|http://nuget.codeplex.com/workitem/1879^0|0|0|2B|13|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1A|8|@]|9|@$F|1B|G|1C|1|1D]]|A|$]]|$1|H|3|I|5|6|7|1E|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1F|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1G|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1H|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|1I|8|@]|9|@]|A|$]]|$1|U|3|V|5|P|7|1J|8|@]|9|@]|A|$Q|R]]|$1|W|3|X|5|6|7|1K|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1L|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]]|11|$12|$5|13|14|15|A|$16|17]]]]

I have run into this problem in two scenarios. 

First, when I attempt to build my solution from the command line using msbuild.exe. 
Secondly, when I attempt to build the sln and the containing projects on my build server using TFS and CI. 

I get errors claiming that references are missing. When inspecting both my local build directory and the TFS server's I see that the /packages folder is not created, and the nuget packages are not copied over. Following the instructions listed in Alexandre's answer <a href="http://nuget.codeplex.com/workitem/1879" rel="noreferrer">http://nuget.codeplex.com/workitem/1879</a> also did not work for me. 

I've enabled Restore Packages via VS2010 and I have seen builds only work from within VS2010. Again, using msbuild fails.My workaround is probably totally invalid, but for my environment this got everything working from a command line build locally, as well as from a CI build in TFS.

I went into .\nuget and changed this line in the .nuget\NuGet.targets file:

from:

<pre><code>&lt;RestoreCommand&gt;$(NuGetCommand) install "$(PackagesConfig)" -source "$(PackageSources)" -o "$(PackagesDir)"&lt;/RestoreCommand&gt;
</code></pre>

to: (notice, without the quotes around the variables)

<pre><code>&lt;RestoreCommand&gt;$(NuGetCommand) install $(PackagesConfig) -source $(PackageSources) -o $(PackagesDir)&lt;/RestoreCommand&gt;
</code></pre>

I understand that if my directories have spaces in them, this will fail, but I don't have spaces in my directories and so this workaround got my builds to complete successfully...for the time being.

I will say that turning on diagnostic level logging in your build will help show what commands are being executed by msbuild. This is what led me to hacking the targets file temporarily.

blocks|key|453705|text|对于其他可能遇到这个问题的人，我能够通过关闭Visual+Studio并重新打开项目来解决这个问题。加载项目时，包将在初始化阶段恢复。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|453706|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Just for others that might run into this problem, I was able to resolve the issue by closing Visual Studio and reopening the project. When the project was loaded the packages were restored during the initialization phase.

blocks|key|453749|text|您必须从以下方式中选择一种：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|453750|在所有解决方案的项目中按其名称重新安装程序包：|453751|Update-Package+–reinstall+<packageName>|code-block|syntax|javascript|453752|按其名称重新安装包，并忽略其在所有解决方案的项目中的依赖关系：|453753|Update-Package+–reinstall+<packageName>+-ignoreDependencies|453754|在工程中按照包的名称重新安装：|453755|Update-Package+–reinstall+<packageName>+<projectName>|453756|重新安装特定工程中的所有包：|453757|Update-Package+-reinstall+-ProjectName+<projectName>|453758|重新安装解决方案中的所有软件包：|453759|Update-Package+-reinstall+|453760|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|17|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|X|5|F|7|1A|8|@]|9|@]|A|$G|H]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

You have to choose one way of the following :

Re-installing a package by it's name in all solution's projects:

<pre><code>Update-Package –reinstall &lt;packageName&gt;
</code></pre>

Re-installing a package by it's name and ignoring it's dependencies in all solution's projects:

<pre><code>Update-Package –reinstall &lt;packageName&gt; -ignoreDependencies
</code></pre>

Re-installing a package by it's name in a project:

<pre><code>Update-Package –reinstall &lt;packageName&gt; &lt;projectName&gt;
</code></pre>

Re-installing all packages in a specific project:

<pre><code>Update-Package -reinstall -ProjectName &lt;projectName&gt;
</code></pre>

Re-installing all packages in a solution:

<pre><code>Update-Package -reinstall 
</code></pre>

blocks|key|668090|text|我在我的系统上做了系统还原，备份了大约两天后，NuGet包崩溃了。(同时还安装了NuGet包。)要修复它，我必须转到我的用户配置文件中的.nuget\packages文件夹，找到这些包，然后删除它们。只有到那时，Visual+Studio才会将包重新拉下，并正确地将它们添加为引用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|668091|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had NuGet packages breaking after I did a System Restore on my system, backing it up about two days. (The NuGet packages had been installed in the meantime.) To fix it, I had to go to the .nuget\packages folder in my user profile, find the packages, and delete them. Only then would Visual Studio pull the packages down fresh and properly add them as references.

blocks|key|668174|text|在我的例子中，一个中止的Nuget恢复尝试已经损坏了解决方案中的一个packages.config文件。在检查我的git工作树之前，我没有发现这一点。恢复文件中的更改后，Nuget恢复再次工作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|668175|entityMap^0|Y|F|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

In my case, an aborted Nuget restore-attempt had corrupted one of the <code>packages.config</code>files in the solution. I did not discover this before checking my git working tree. After reverting the changes in the file, Nuget restore was working again.

blocks|key|453999|text|我找到的最好的解决办法是从头开始创建一个新项目，然后导入所有带有代码的源文件。我的项目并不是很复杂，所以我没有任何问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|454000|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The best workaround that I found creating a new Project from scratch,
then import all the source files with the code.
My project was not so complicated so I had no problem from there.

blocks|key|668279|text|VS+2017|type|unstyled|depth|inlineStyleRanges|entityRanges|data|668280|Tools>NuGet包缓存管理器Settings>General单击"Clear+All+NuGet+Manager>Package+(S)“|668281|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

VS 2017

Tools>NuGet Package Manager>Package Manager Settings>General
Click on "Clear All NuGet Cache(s)"

blocks|key|668383|text|如果其他答案对你都不起作用，那么尝试以下方法，这是唯一对我有效的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|668384|找到.csproj文件并在文本编辑器中对其进行编辑。|offset|length|style|CODE|668385|在.csproj文件中找到<Target+Name="EnsureNuGetPackageBuildImports"+BeforeTargets="PrepareForBuild">标记并删除整个块。|668386|重新安装解决方案中的所有软件包：|668387|Update-Package+-reinstall|code-block|syntax|javascript|668388|在此之后，您的nuget包应该被恢复，我认为这可能是一个边缘情况，只有当您将项目移动到不同的位置时才会发生这种情况。|668389|entityMap^0|0|2|7|0|1|7|D|26|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@$D|Z|E|10|F|G]|$D|11|E|12|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|13|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|14|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|T|$]]

If none of the other answers work for you then try the following which was the only thing that worked for me:

Find your <code>.csproj</code> file and edit it in a text editor.

Find the <code>&lt;Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild"&gt;</code> tag in your <code>.csproj</code> file and delete the whole block.

Re-install all packages in the solution:

<pre><code>Update-Package -reinstall
</code></pre>

After this your nuget packages should be restored, i think this might be a fringe case that only occurs when you move your project to a different location.

blocks|key|668442|text|对于我来说，我在.csproj中有一个空的标记NuGetPackageImportStamp|type|unstyled|depth|inlineStyleRanges|entityRanges|data|668443|<NuGetPackageImportStamp>
++++</NuGetPackageImportStamp>|code-block|syntax|javascript|668444|理想情况下它应该包含一些有效的GUID。|668445|删除这个标签，然后“恢复Nugets”对我来说是有效的。|668446|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For me, I had an empty tag NuGetPackageImportStamp in .csproj
<pre class="lang-xml prettyprint-override"><code>&lt;NuGetPackageImportStamp&gt;
 &lt;/NuGetPackageImportStamp&gt;
</code></pre>
It should ideally contain some valid GUID.
Removing this tag and then &quot;Restore Nugets&quot; worked for me.

blocks|key|668508|text|在VS2017中，右键单击解决方案=>打开CommandLine+=>+Developer命令行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|668509|打开后，键入(然后按enter键)|668510|dotnet+restore|code-block|syntax|javascript|668511|这将恢复任何/所有包，并且您会得到一个很好的控制台输出，其中显示了所做的一切。|668512|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In VS2017, right-click on the solution => Open CommandLine => Developer Command Line.

Once thats open, type in (and press enter after)

<pre><code>dotnet restore
</code></pre>

That will restore any/all packages, and you get a nice console output of whats been done...

blocks|key|454283|text|我最近也遇到了这个问题。通常的“dotnet+restore”和“Update-Package-reinstall”没有帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|454284|我查看了.csproj文件，发现这些包的值不一致。一些人指向<solutiondir>\packages，另一些人则是<projectdir>\packages。|offset|length|style|CODE|454285|我让它们都指向同一个位置(我相信是指向<projectdir>\packages)，然后我就可以恢复NuGet包了。|454286|我不确定.csproj文件是如何指向两个不同位置的。也许从Visual+Studio+2017+(或更早的版本)开始，然后迁移到Visual+Studio+2019？或者不同的程序员使用不同的设置？我真的不知道。|454287|entityMap^0|0|U|M|1N|L|0|J|L|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]|$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|W|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|M|$]]

I experienced this problem recently as well. The usual 'dotnet restore' and 'Update-Package -reinstall' didn't help.
I looked at the .csproj file and found that the values for these packages were inconsistent. Some were pointing to <code>&lt;solutiondir&gt;\packages</code> and some were <code>&lt;projectdir&gt;\packages</code>.
I made them all point to the same place (I believe that was to <code>&lt;projectdir&gt;\packages</code>) and then I was able to restore the NuGet packages.
I'm not sure how the .csproj file ended up pointing to two different places. Maybe from starting out in Visual Studio 2017 (or earlier) and then moving to Visual Studio 2019? Or different settings used by different programmers? I really don't know.

blocks|key|454340|text|我遇到了相同的问题，但解决我的问题的是转到Nuget+Package+Manager+(右键单击prj+>选择Manage+Nugget+Packages)，卸载并再次安装有问题的包。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|454341|但是有一些包与其他包有依赖关系，所以我所做的是先卸载依赖关系，然后再卸载我想要卸载并重新安装的nuget包。|454342|当您尝试卸载nuget时，您可以查看nuget是否有依赖项，然后访问输出窗口，将会有一行说明nuget由于依赖项而无法卸载，并且这些依赖项也会在那里列出。|454343|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

The same problem I encountered but what solved my problem was to go to Nuget Package Manager (rightclick to the prj &gt; select Manage Nugget Packages) and uninstall and install again the packages that are having issues.
BUT there are some packages having dependencies to other packages, so what I did was to uninstall the dependencies first and then followed by the nuget package that I wanted to uninstall and re-install.
You can find out if the nuget has dependencies when you tried to uninstall it and then visit the Output window, there will be a line saying that the nuget failed to uninstall because of its dependencies, and those dependencies are also listed there.

I checked in a project on one computer, checked out on another, and find that the binaries installed by NuGet are missing. I could check them in to source control as well, but it looks like there's a better solution:

<a href="http://docs.nuget.org/docs/workflows/using-nuget-without-committing-packages">http://docs.nuget.org/docs/workflows/using-nuget-without-committing-packages</a>

I followed those instructions, now have a <code>.nuget</code> folder where one should be, have the following entries in my .csproj file:

<pre><code>&lt;RestorePackages&gt;true&lt;/RestorePackages&gt;
&lt;Import Project="$(SolutionDir)\.nuget\nuget.targets" /&gt;
</code></pre>

and yet when I rebuild my solution, the missing packages are not restored. 

What am I missing? How can I diagnose this problem?

NuGet Package Restore Not Working

Visual Studio

服务器

我在一台计算机上签入一个项目，在另一台计算机上签出，发现NuGet安装的二进制文件丢失了。我也可以将它们签入源代码控制，但看起来有一个更好的解决方案：我遵循了这些说明，现在在我的.csproj文件中有了一个应该有的.nuget文件夹，并有了以下条目：<RestorePackages>true</RestorePacka...

问NuGet包还原不起作用
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